Generic in Swift

ExampleGeneric.swift

// Find index position of item using Generic

  func genericFindItem() {
    let names = ["A", "B", "C", "D", "E"]
    if let result = self.findItem(of: "D", in: names) {
      print(result)
    }
  }
  
  func findItem<T: Equatable>(of foundItem: T, in items: [T]) -> Int? {
    for(index, item) in items.enumerated() {
      if item == foundItem {
        return index
      }
    }
    return nil
  }

// Pass value as array in Generic

  func genericPassArray() {
    printArray(array: ["1", "2", "3", "4"])
    printArray(array: [1, 2, 3, 4])
    printArray(array: [1.1, 1.2, 1.3, 1.4])
  }
  
  func printArray<T>(array: [T]) {
    print(array)
  }


// Usage of Generic in Struct

  func genericRandom() {
    
    let randomIntegers = RandomContainer(items: [1, 2, 3, 4, 5, 6, 7])
    print(randomIntegers.getRandom())
    
    let randomStrings = RandomContainer(items: ["a", "b", "c", "d", "e"])
    print(randomStrings.getRandom())
  }

struct RandomContainer<T> {
  
  var items = [T]()
  
  func getRandom() -> T {
    let randomIndex = Int(arc4random_uniform(UInt32(items.count)))
    return items[randomIndex]
  }
}